I have heard of this happening before. Only it was a pizza joint and the lady working alone was in the middle of an order and told the man to wait his turn. He got tired of waiting and left. It happened in SC, where the story didn't have enough crazy to be reported in the papers.

I kind of wonder if the woman didn't notice the gun as she told him to wait and then decided 'I ain't stupid enough to go back out there'.

My aunt was working in my granpas liquor store when an armed robber demanded all the cash. She yells out to gramps in the back "uh, dad? There's a guy here with a gun and he wants all the money" lol, the burglar just took off.